Quicksilver lovers who are sick of arrow-ing down QS's list of suggestions for a keyword can manually set an item as the default. For example, if you want typing "tex" to open TextWrangler and not TextEdit, Ctrl+click on TextWrangler on the suggestion list and choose "Set as Default for TEX." Quicksilver's pretty smart about figuring out what you want most of the time based on usage frequency, but for those rare cases when it doesn't, this'll do the trick.